Serve the customer-facing menus

Landing page, Section pages and archived sets rendered per request from the
store, with the approved design: hand-written CSS, self-hosted Archivo, a
copper pour line in the Section rail, an admin-only Thumbnail and a text page
index. Media is keyed by Page id so URLs survive publishing, and a Draft's
media needs a session. Includes the scrypt admin auth and the login throttle
the media rule needs.

.gitignore

@@ -1,5 +1,6 @@
 node_modules/
 .npm-cache/
 .tmp/
+.dev/
 *.log
 site.env